Method of regulating- length of stroke in moutising-machines



UNITED STATES PATENT OFFICE.

EZRA GOULD, OF NEWTARK, NEW' JERSEY.

METHOD OF REGULATING- LENGTH OF-STROKE IN MO'RTISING-MACHINES.

Specification of Letters Patent No. 13,594, dated September 25, 1855.

To all whom t may concern:

f' Be it known that I, EZRA GOULD, of Newark, in the county of Essex andState of New Jersey, have invented a new and ImprovedMortising-h/Iacliine; and I do hereby declare that the following is afull, clear, and exact description of the same, reference being had tothe annexed drawings, making a part of this specification, in which-Figure l, is a side view of my improvement, the driving` pulley at theupper end of thev machine being bisected through its center, asindicated by the line w, Fig. 3. Fig. 9., is a front view of ditto. Fig.8, is a back view of the driving pulley.

Similar letters of reference indicate corresponding parts in the severalfigures.

The nature of my invention consists in giving a variable throw orvibration to the arbor to which the chisel is attached, by means of acurved slotted arm and plate, said plate having a pin attached to itwhich fits in the upper end of a connecting rod, the plate also having apin attached which fits in the slot of the curved arm. The curved arm ismoved or operated by gearing which will be presently shown anddescribed, and the connecting rod is attached to the arbor of thechisel.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

A, represents the driving pulley of the machine the shaft a, of whichworks in a bearing b, at the upper part of a suitable framing B. Thepulley A, has a radial slot c, made in it, from its center to itsperiphery,

and this slot has guides d, CZ, at each side of it on the outer side ofthe pulley, between which guides a plate e, is fitted and works.

To the inner end of the plate e, there is attached a pin f, to which theupper end of a rod- C, is connected, the lower end of said rod beingattached to a guide block g, which is connected to an arbor D, saidarbor working in suitable guides or bearings h, attached to the framingB. To the outer end of the plate e, there is attached a pin z', whichpasses through the slot c, and into a slot j, in a curved arm E, whichworks against the back side of the driving pulley A. The inner end ofthe arm E, has a pinion 7c, attached to it, and this pinion is fittedloosely on'the shaft a.

Upon the end of the shaft a, opposite to the end to which the pulley A,is attached,

there is placed loosely a pinion Z, said pinion being between a circularplate m, attached permanently to the shaft a, and a pinion n, whichturns with the shaft a, and still is allowed to slide upon it, inconsequence of it being attached thereto by a groove and feather.

Underneath the shaft a, there is a shaft 0, which works in suitablebearings 29, p, on the framing B. The shaft 0, has a pinion g, attachedpermanently to one end, said pinion gearing into the pinion lo, attachedto the arm E. The opposite end of the shaft 0, has a pinion r, attachedpermanently to it, and a loose pinion s, is placed upon it, the pinions, being between the pinion (r) and a circular plate t, attached to theend of the shaft by a feather and groove. The pinion 7, gears into theloose pinion Z, on the shaft a, and the loose pinion s, on the shaft 0,gears into the pinion n, on the shaft 0.

To the upper end of the framing B, at its back part there is attached alever F. The fulcrum of said lever is at u. The upper end of the leverF, bears against the end of a collar e, attached to the pinion n, andthe lever below the fulcrum u, bears against a collar fw, attached tothe circular plate t. The lever F, may be connected in any proper mannerto a treadle so that the lever may be operated by the foot.

. To the front upright of the framing B, a bed plate Gr, is attached bya socket H, and set screw a', the socket sliding on the upright andsecured at any desired point by the set screw.

I, I, are rods which pass through a plate J, attached to the framing B,the rods being over the bed plate G.

Motion is given the machine by a band passing around the pulley A. Thestuff to be mortised is placed upon the bed plate G, and clamped betweenthe lower ends of the rods I, I. Now if the lever F, be so operated thatthe part of the lever F, below the fulcrum n, bears upon the collar w,of the plate t, said plate t, will clamp the pinion s, between itselfand t-he pinion r, and the pinion n, on the shaft a, will give motion tothe shaft 0, which will be slower than the shaft a. The pinion g, turnsthe pinion 7c, and the arm E, will consequently be turned and will drawthe plate e, from the center of the pulley to the outer end of the slotsy', and c, and the arbor D, will then have its greatest throw or lengthof vibration. By moving the lever F, in the opposite direction so thatthe upper end of the lever F, will bear against the collar 0, of thepinion n, the pinion Z, will be clamped between the pinion n, and platem, and the pinion Z, will then turn the pinion 1^, and as the pinion Z,is larger than the pinion r, the shaft 0, will rotate faster than theshaft a, and the arm E, will consequently be moved in the oppositedirection and the plate c, will be moved to the inner end of the slotsy', and c, and the arbor D, will remain stationary while the pulley A,rotates.

When the stuff is to be adjusted upon the bed piece Gr, the lever F, ismoved as above described so as to stop the throw or vibration of thearbor, and when the stuff is properly adjusted on the bed piece thelever is moved in the opposite direction and the arbor obtains graduallyits greatest throw or vibration each stroke gradually increasing inlength till the plate e, reaches the outer ends of the slots j, 0. Bythis variable throw the stuff may be adjusted upon and taken from thebed piece G, without stopping the inotion of the pulley A, and thechisel which is attached to the lower end of the arbor may also beturned without stopping the pulley, for if the vibration of the arbor isstopped that is all that is required. Further a great advantage isobtained in mortising by having the stroke of the arbor graduallyincrease in length, because the chisel cannot readily enter the wood thefull depth of the mo-rtise at the first cut, but by having the cutsgradually increase in dept-h at each stroke the chisel can easily partthe wood or chips at each cut and mortises may be cut without breakingthe chisel, it being understood that the chisel is reversed at the endof the mortise and the stuff moved in the opposite direction upon thebed plate as usual.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

Attaching the connecting rod C, to a curved slot-ted arm E, by means ofthe plate e, and pins f, z', the plate e, working in a slot c, in thepulley A, and the arm E, operated by meansbfthe gearing Z, n, p, s, andg, Z0, arranged as shown or in an equivalent way for the purposespecified.

EZRA GOULD.

Witnesses:

FRANCIS H. GroULD, DAVID ALMOND.

